They built a nice setup on Linus Tech Tips a little while ago. Pricing is mentioned in the vid. I think the motion thing was about $3k USD.

The video

https://www.youtube.com/watch?v=lJkPtX4rXug

The motion thing for the seat https://www.nextlevelracing.com/products/next-level-racing-m...

I expect the entire build, with PC and monitor, wheel, etc, was around $10k

I made something for my masters project for under $2k - using pneumatic artificial muscles.

https://www.youtube.com/watch?v=yJCORZuLOJk

Still needed a lot of tweaking when the video was made...

Entry level setup https://www.youtube.com/watch?v=jXGKdk6apRo